查詢結果分析
來源資料
相關文獻
- The Surface Normal Impedance and the Absorption Coefficient of a Regularly Perforated Surface on the Catalytic Converter Substrate
- Opacity of White Envelope Papers
- 預估主機振動傳遞及散發之水中噪音
- 診斷X光照射下軟組織、水、脂肪與骨骼對氟化鋰的平均質量能量吸收係數比與 因數的研究
- Expressing the Color of Black Paper by BL[fec8] Value
- Conjugate Mixed Convection-Conduction Heat Transfer from a Vertical Cylindrical Fin
- 生物化學工程學基礎研究(2):醱酵槽內氧傳遞係數(KLa或Kd) 與操作變數關係之研究
- 以軌跡模式評估中部地區空氣品質之適用性研究
- 蔗糖溶液熱傳遞係數之測定
- 粗糖溶液之熱傳遞係數
頁籤選單縮合
題 名 | The Surface Normal Impedance and the Absorption Coefficient of a Regularly Perforated Surface on the Catalytic Converter Substrate=觸媒轉換器基層之規則穿孔表面的正交阻抗及吸收係數之推導 |
---|---|
作 者 | 黃德言; | 書刊名 | 中華民國音響學刊 |
卷 期 | 6:1 1999.06[民88.06] |
頁 次 | 頁37-55 |
分類號 | 334.508 |
關鍵詞 | 觸媒轉換器基層; 表面正交阻抗; 傳遞係數; 吸收係數; Catalytic converter substrate; Surface normal impedance; Transmission coefficient; Absorption coefficient; |
語 文 | 英文(English) |
中文摘要 | 當聲波傳播於觸媒轉換器基層的狹窄通道中時,黏滯性及熱傳導是造成不可逆的 動量及熱的傳遞的機轉,並是引起聲能衰減的原因。藉由分別考慮黏滯及熱效應的分析方法 ,可求得聲波在狹窄通道中傳播時的常數,並由此計算觸媒轉換器基層之週期性穿孔表面的 正交阻抗、反射係數、傳遞係數及吸收係數,以瞭解聲波傳播於轉換器基層的狹窄通道中之 聲學現象。 |
英文摘要 | When the sound wave propagates in the narrow channels of the catalytic converter substrate, the mechanisms responsible for the irreversible transfer of momentum and heat are the viscosity and the heat conduction, which cause attenuation of the acoustic energy. An analytical approach taken for the first time by Zwikker and Kosten is implemented here to derive the complex density and the complex bulk modulus by considering the viscous effects separately from the thermal effects. The viscous effects and the thermal effects are combined together by using the complex density and the complex bulk modulus to define the complex speed of wave propagation and then to obtain the complex propagation constant of sound wave in the narrow channel. Finally, the propagation constant was used to calculate the surface normal impedance, the reflection coefficient, the transmission coefficient and the absorption coefficient for infinite depth of periodically perforated surface of the catalytic converter substrate to get physical insight into the acoustic phenomena in the narrow channels of the substrate. |
本系統中英文摘要資訊取自各篇刊載內容。